The pulse pressure difference is the difference between systolic and diastolic blood pressure. The pulse pressure difference in a normal person is about 40 mm Hg. The pulse pressure difference is generally correspondingly higher in people with hypertension and smaller in people with hypotension, usually around 30. Increased pulse pressure difference is commonly seen in patients with simple systolic hypertension. It is most often seen in the elderly, such as 170/80 mmHg, and is found in approximately 40-50% of elderly people with hypertension. The cause is mainly due to aortic sclerosis. When the heart is systolic, the sclerotic aorta cannot expand moderately, making the systolic pressure increase sharply; when the heart is diastolic, the aortic retraction ability is also weakened, and it cannot push the blood forward sufficiently, thus the diastolic pressure is too low. The systolic pressure shows a disproportionate increase and the pulse pressure becomes larger. Some patients are concerned that the normal diastolic blood pressure will drop further after the drug is administered. Generally speaking, that does not happen. If you feel unsure, you can ask your doctor to consider the most appropriate medication and dose for your condition, and schedule more follow-up visits. So when will the pulse pressure difference be small? The main reason for the narrowing of the pulse pressure difference is a decrease in the amount of blood pulsating in the heart, while the peripheral vascular resistance remains unchanged. However, the process of its formation needs to be analyzed specifically. For example, in patients with hypertension, the heart must contract more to overcome resistance and maintain normal blood flow due to increased resistance in the peripheral arteries. In the long run, the heart muscle becomes hypertrophic, and eventually the heart function loses compensation (exhaustion) and the discharge volume gradually decreases, and the pulse pressure difference decreases accordingly. In addition to myocardial and valvular lesions, there are many factors that can affect the contractility of the heart, especially endocrine and humoral factors. For example, the increase in blood volume due to excessive salt intake, which increases the load on the heart and weakens the blood pumping function; abnormal estrogen levels in women around menopause; and endocrine abnormalities such as renin, aldosterone, and catecholamines, all of which may adversely affect cardiac function in different ways. Increased circulatory resistance in high blood viscosity can also reduce the amount of blood pulsed by the heart. Patients with reduced pulse pressure differential often feel very uncomfortable. This is due to a general lack of blood supply to all vital organs at this time, causing patients to experience symptoms such as dizziness and headache, chest tightness and breath-holding. People with normal or low blood pressure often have similar symptoms if the pulse pressure difference is below 30 mmHg, and many people also have weakness and other discomforts.